Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a8126d7ddff16f…

MALICIOUS

PDF

72.8 KB Created: 2021-03-20 08:17:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0398c8c16677bb20523992d301423096 SHA-1: 6be59f960f4dd9c27117b5bced5c5b166bbc6934 SHA-256: c0a8126d7ddff16f032e3a26b4ab6edfc4b87b13347fb201e83162faa85c963f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains or link farms, suggesting a malicious SEO or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/award?keyword=concepts+of+networking+pdf PDF link annotation
    • https://cdn.sqhk.co/lafuwexale/jWjekje/muxon.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/AghVfhg/jowawudi.pdfIn PDF document text
    • http://cadenalia.com/kenmore_elite_washer_not_workingj84rm.pdfIn PDF document text
    • https://borirokuve.weebly.com/uploads/1/3/1/4/131437567/61b30e4.pdfIn PDF document text
    • https://cdn.sqhk.co/dogojaseziwo/XKmYdhh/apa_citation_guide_6th_edition.pdfIn PDF document text
    • https://lanilemu.weebly.com/uploads/1/3/1/3/131381326/tojobedufa-varuwodasekufeb-puvijil.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/gh7hjsb/descargar_the_pirate_plague_of_the_dead_hackeado.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/ihficgi/horse_running_sound_effect_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/ijuCIsH/regowedosi.pdfIn PDF document text
    • https://wiloropijevor.weebly.com/uploads/1/3/5/2/135299547/5d92217b3d8be19.pdfIn PDF document text
    • http://tryici.xyz/victory_family_church_service_times_norman_okztd7i.pdfIn PDF document text
    • http://warewakeb.sportsontheweb.net/40542913640.pdfIn PDF document text
    • http://daritibule.iblogger.org/empathy_map_template_doc.pdfIn PDF document text
    • http://zahlungsservice-ch.site/the_house_of_the_spirits_chapter_8_summaryuswnu.pdfIn PDF document text
    • http://mnclassis.org/runurazaxozakufupu7r5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wovodijulenape.onlinewebshop.net/10981910610.pdfIn PDF document text
    • http://pipinodojo.epizy.com/bartender_song_rehab_free.pdfIn PDF document text
    • http://domuromu.atwebpages.com/vijujujebimov.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 5144 bytes
SHA-256: d3bfab9e41b9763e01b9f6725e809821ed354266703a6edcd4100dffb64a953b
font_01_sfnt_off0000f1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 10708 bytes
SHA-256: b5f58bee5259ccb5aefc6aff64b1d150767ec4d528a90314809fa8999987c77f

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